Scramble fix
Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/io_u.c b/io_u.c
index 5959bf7..38efcc1 100644
--- a/io_u.c
+++ b/io_u.c
@@ -1129,6 +1129,7 @@
static void small_content_scramble(struct io_u *io_u)
{
unsigned int i, nr_blocks = io_u->buflen / 512;
+ unsigned long long boffset;
unsigned int offset;
void *p, *end;
@@ -1136,20 +1137,23 @@
return;
p = io_u->xfer_buf;
+ boffset= io_u->offset;
+
for (i = 0; i < nr_blocks; i++) {
/*
* Fill the byte offset into a "random" start offset of
* the buffer, given by the product of the usec time
* and the actual offset.
*/
- offset = (io_u->start_time.tv_usec * io_u->offset) & 511;
+ offset = (io_u->start_time.tv_usec ^ boffset) & 511;
if (offset >= 512 - sizeof(unsigned long long))
offset -= sizeof(unsigned long long);
- *((unsigned long long *) p + offset) = io_u->offset;
+ *((unsigned long long *) p + offset) = boffset;
end = p + 512 - sizeof(io_u->start_time);
memcpy(end, &io_u->start_time, sizeof(io_u->start_time));
p += 512;
+ boffset += 512;
}
}